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The FN 545 MRD is FN America's answer to the question of what a modern full-size .45 ACP service pistol should look like in 2024. It takes the bones of the well-regarded FN 509 series and scales them up for .45 ACP, delivering a striker-fired platform that handles and points like a duty pistol while offering optics-ready capability that most big-bore guns in this class still can't match.
The slide is machined steel with a black PVD finish, front and rear cocking serrations, a loaded chamber indicator, and FN's patented Low-Profile Optics Mounting System. That last part matters a lot. Rather than one fixed cut that only works with a handful of optics, FN ships four MRD mounting plates that cover all the popular footprints including Trijicon RMR/SRO, Leupold DeltaPoint Pro, Holosun 507/508, Vortex Venom/Viper/Razor, Docter, C-More STS2, and Burris FastFire. You can drop a red dot on this gun in minutes without a gunsmith and without second-guessing compatibility. The driftable steel co-witness sights stay in the picture whether you run an optic or not.
The 4.1-inch barrel is cold hammer-forged with a recessed target crown and a polished feed ramp, two features that directly contribute to both long-term accuracy and reliable feeding across a wide range of commercial .45 ACP loads. The polymer frame rides on a MIL-STD-1913 Picatinny rail, comes with two interchangeable backstraps for a customized fit, and the grip texture does real work in terms of recoil management. The trigger breaks clean at approximately 6 pounds with an audible and tactile reset, which is about what you want from a duty-style striker-fired pistol.
All operating controls are fully ambidextrous, with a mirrored slide stop lever and magazine release on both sides of the frame. This is a genuine lefty-friendly gun, not an afterthought. This 10+1 configuration ships with two 10-round magazines and is well suited for range use, home defense, or any application where a capable, optics-ready .45 ACP in a proven platform is the goal.
The FN 545 MRD uses FN's patented Low-Profile Optics Mounting System, which ships with four mounting plates covering most of the popular footprints on the market. Supported optics include the Trijicon RMR and SRO, Leupold DeltaPoint Pro, Holosun 507/508, Vortex Venom, Viper, and Razor, as well as Docter, C-More STS2, and Burris FastFire. Installation doesn't require a gunsmith and FN's fastener system is self-locking, so no thread locker is needed.
This particular configuration (MPN 66-101389, UPC 845737015718) ships with two 10-round magazines for a total capacity of 10+1. FN does offer separate variants of the 545 MRD that come with 15-round magazines, so it is worth confirming the magazine configuration before purchasing if capacity is a priority.
The MRD is the non-threaded, flush-barrel variant of the 545 platform. It uses a 4.1-inch target-crowned barrel without threading, standard co-witness day sights instead of tritium suppressor-height sights, and ships with 10- or 15-round magazines depending on the variant. The Tactical model has a longer 4.71-inch threaded barrel, tritium night sights, and a higher base capacity. If you don't need a suppressor-ready setup, the MRD is the more straightforward option and is typically easier to find in restricted-capacity configurations.
The 545 MRD is designed with recoil management as a core ergonomic priority. The polymer frame's grip contouring and texture, combined with the interchangeable backstraps that let you adjust the fit for your hand, help keep muzzle rise in check even with hotter loads. Range feedback on the 545 platform consistently notes that it handles the .45 ACP round well for a pistol of this size, staying controllable during rapid firing.
No, the FN 545 MRD does not have a manual thumb safety. Like most modern striker-fired service pistols, it relies on trigger and drop safeties integrated into the fire control group. This is typical for duty and home defense oriented platforms in this category.
Yes. The FN 545 MRD is equipped with a full MIL-STD-1913 Picatinny rail on the frame, which is compatible with the vast majority of pistol-mounted weapon lights and laser aiming devices on the market. The rail is sized to handle full-size lights, not just compact ones.
| UPC | 845737015718 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 66-101389 |
| Action | |
| ATF Type | Pistol |
| Barrel Length | 4.1" |
| Caliber/Gauge | .45 ACP |
| Capacity | 10 + 1 |
| Color | Black |
| Length | 11.9500 |
| Number of Magazines | 2 |
| Package Height | 3.3 |
| Package Width | 11.2 |
| Product Type | Semi-Auto Pistol |
| Safety | No |
| Shipping Weight | 4.0 |
| Sights | Driftable Steel Co-Witness |
| Sights Type | Driftable Steel Co-Witness |
| Slide Description | Optic Cut/Serrated |
| State Restriction (CA) | NO DIRECT SHIP TO CALIFORNIA |
| State Restriction (RI) | NO DIRECT SHIP TO RHODE ISLAND |
| State Restriction (WA) | NO DIRECT SHIP TO WASHINGTON |
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